<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        
    </style>
</head>
<body>
    
</body>
<script>

    console.log( Math.round( 5.7 ) );
    console.log( Math.round( -5.7 ) );
    console.log( Math.random(10, 20) );
    console.log( Math.pow(2, 4) );
    console.log( Math.sqrt(9) );
    console.log( Math.abs(-9) );
    console.log( Math.max( [23,56,34,72,13] ) );
    console.log( Math.max( 23,56,34,72,13 ) );
    console.log( Math.min( 23,56,34,72,13 ) );
    console.log( Math.ceil( 3.00000001 ) );
    console.log( Math.floor( 3.99999999 ) );

    console.log( Math.PI );

    console.log( Math.sin( Math.PI / 180 * 90 ) );
    console.log( Math.cos( Math.PI / 180 * 90 ) );

    // 角度转弧度
    // Math.PI / 180 * 角度







    
</script>
</html>